Hire the Best VOIP Software Engineers

I am VoIP/VICIDIAL/VICIBOX/Asterisk/FreePBX/GoAutodial/vTiger/3CX developer and solution provider with past 16+ years of rich experience. I have expertise in them, and so i am confident to serve you for the same. I have rich telecom, web and custom software development and support experience. I'm interested in your job & I guarantee doing it in short time. I didn’t ask for an upfront as I'm interested in building long term relationships based on trust because I'm confident with my quality of work.

With 16+ years of experience, I help businesses build scalable, secure, and high-performance communication platforms. I specialize in end-to-end VoIP development, WebRTC applications, and AI-powered voice automation. Core Expertise: VoIP Development (Asterisk, FreeSWITCH, Kamailio, OpenSIPS) WebRTC Apps (Audio/Video Calling, Live Streaming) SIP, RTP, IVR, Call Routing & Softswitch (Class 4/5) AI Voice Bots & AI Receptionist Solutions UCaaS, CPaaS & API Integration (Twilio, Plivo, etc.) Media Streaming & Low-Latency Systems Scalable Server Architecture (AWS, Docker, Kubernetes) CRM/ERP & Third-party Integrations WebRTC Application Development - Audio & Video Conferencing - WebRTC, Jitsi, Twillio, OpenTok, Kurento - Screen Sharing, Recording - Online Tutoring and E Learning - Telemedicine and Health Applications - Video Broadcasting and Live Streaming - SFU, STUN & Multiple Server architectures VoIP Service: - Asterisk/Freeswitch/OpenSIP/Kamilio setup & Configurations - PBX System & Software Development - Unified Communication Software - CallCenter Softwares - DID Management - Auto/Predictive Dialer - Mobile or Sip or VoIP Dialers - Real Time billing software - Distributed Server Architecture - Load Balancing and failover setup - Server Administration, Maintenance & 24*7 Support AI-Integration and Automation - Smart voice agents (inbound & outbound calls) - AI chatbots for web, WhatsApp & apps - Speech-to-text & text-to-speech integration - Multilingual conversational systems - Call automation (sales, support, reminders) - AI receptionist and appointment setter - AI content generation (text, image, audio) - Knowledge base chatbots - AI copilots for internal teams - Integrated LLMs for context-aware, deterministic voice interactions Technology, Platforms and languages expertise: Frontend Web: Angular, React.js, Vue.js, PHP Backend: Java, PHP, Laravel, Node.js, Python WebRTC: Native, Kurento, Tokbox, Jitsi, janus, OpenVidu VoIP: Freeswitch, Asterisk, Twillio, Kamilio, OpenSIP, FusionPBX, FreePBX, SIPJs AI/ML: OpenAI, Whisper, ElevenLabs, n8n, Retell

I build, integrate, and debug VoIP and calling systems on Asterisk from a single SIP trunk to multi-tenant calling platforms. Whatever the calling problem is setup, integration, broken audio, or a full build I take it to production and document it for your team. What I help with: → Asterisk, Wazo, FreePBX, FusionPBX — setup, configuration, and production debugging → SIP trunking with any provider — Telnyx, Twilio, Plivo, Bandwidth → Inbound/outbound call routing, IVR, queues, CDRs, recordings, webhooks → Kamailio + RTPEngine — SIP routing and media bridging → WebRTC dialers & softphones — JsSIP, SIP.js, MicroSIP, Zoiper, Linphone → WhatsApp Business / Meta Calling — SIP gateway, DTLS-SRTP, ICE, RTP → NAT, codec, and one-way-audio troubleshooting on live SIP traces (sngrep, Wireshark) → Multi-tenant VoIP SaaS with REST API management → Voice AI & call-automation pipelines on top of SIP (LiveKit, agents) → Self-hosted on DigitalOcean, Azure, AWS — any Linux host Recent proof: I built multi-tenant WhatsApp Business Calling on a Wazo/Asterisk platform — a Kamailio → RTPEngine → Asterisk media bridge handling DTLS-SRTP from Meta's SIP gateway, with a WebRTC dialer, per-tenant routing, IVR, recordings, CDRs, and full API control. The client kept me on for ongoing work. I've also deployed self-hosted Asterisk on DigitalOcean with full trunk and dial-plan config — production, not a test lab. Tell me what you're building or what's broken, and I'll tell you straight if I'm the right fit. — Zahid

I am a certified developer with experience in building contact center IVR's for small and large sized businesses. If you're trying to win work, list your services or call flows that you want for you to expand or improved your line of business - I can help! *I'm experienced in Studio Building basically on Java language. *I'm experienced and certified in building RingCentral UCaaS and CCaaS IVRs and Call Flow logics. *I can also do digital assistant for your needs. *Helpdesk and Support for Technical Tickets related to platforms issue. *Can fully managed the Unified Comms and Contact Center platform all at once. *I'm fully project manage your brief from start to finish. *Regular communication is a must, so let's keep in touch!

I help businesses build reliable, scalable communication systems and web applications by combining deep expertise in VoIP (3CX & Yeastar) with full-stack development and API integrations. With 6+ years of experience in 3CX, hands-on expertise in Yeastar Cloud PBX, and 3+ years in full-stack development, I specialize in delivering end-to-end solutions — from telephony infrastructure to CRM integrations and custom dashboards. 🔥 What I Can Do For You ☎️ VoIP & PBX Solutions (3CX + Yeastar) 3CX setup, configuration & troubleshooting (V18/V20) Yeastar Cloud PBX deployment & management SIP Trunk integration (Twilio, Telnyx, Flowroute, etc.) IVR, Call Queues, Ring Groups, Call Routing Predictive / Progressive Dialer setup Call recording, reporting & analytics Multi-tenant PBX architecture DID management & call flow optimization 💻 Full Stack Development Backend: PHP, Node.js, Golang Frontend: JavaScript, HTML, CSS, Bootstrap, Tailwind Database: MySQL, PostgreSQL Build scalable CRM systems & dashboards WebRTC / SIP dialer development Real-time systems & automation workflows 🔗 API Development & Integrations (Swagger/OpenAPI) REST API design & development Swagger/OpenAPI documentation CRM integrations (Zoho, Salesforce, Monday, etc.) Webhooks, automation, and data sync systems 🌐 WordPress Development Custom theme & plugin development Website optimization & speed improvements API integrations with WordPress Business websites & landing pages 💡 Why Clients Choose Me ✔ 6+ years in VoIP & telephony systems ✔ Strong backend + infrastructure understanding ✔ Fast troubleshooting & problem-solving ✔ Clean, scalable, production-ready solutions ✔ Excellent communication & long-term support 📌 Recent Work Highlights Built multi-company 3CX dialer system with CRM integration Deployed Yeastar Cloud PBX for international clients Developed VoIP analytics dashboards & call tracking systems Integrated Twilio / Telnyx with custom applications Created API-driven automation workflows using webhooks 🎯 Let’s Work Together If you need help with: Setting up or fixing your 3CX / Yeastar PBX Building a custom dialer or VoIP system Integrating APIs or CRM systems Developing a scalable web application 👉 Send me a message — I’ll provide a clear solution quickly.

I specialize in VoIP solutions with a focus on RingCentral (EX & CX) and Zoom (Phone & CC) project implementation and ongoing support. As a subject matter expert in the field, I work with businesses of all sizes to streamline communication systems, resolve complex technical challenges, and deliver seamless transitions to cloud-based telephony. Here's what you can expect when working with me: Deep Roots in VoIP: I'm not just certified; I'm passionate about what I do. With experience in RingCentral, Avaya, Zoom and Vonage, I'm well-versed in the intricacies of these platforms both in its UCaaS and CCaaS versions. Your Time Matters: I understand that every second counts in your business. That's why you can rely on me for prompt responses and effective solutions. Who I Serve: From small startups to large enterprises, I've had the privilege of assisting businesses of all sizes. My expertise spans various industries, including law firms, universities, fitness, and finance, to name a few. Here is a list of the most common tasks I perform within a VoIP platform: Call queues / Auto Attendant - IVR Call Forwarding / Call Routing Voicemail Setup / Custom Answering Rules Porting / User setup / Limited extensions SMS Automation** (10DLC) Multi Site Call logging expert / Audit trail Announcement / Audio greetings - Voice over Desk Phone Provisioning I'm here, ready to be your partner in enhancing your communication systems. Reach out to me here on Upwork and let's start a conversation, looking forward to understanding your unique needs and finding the perfect solution for you!